// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_AURA_ENV_OBSERVER_H_
#define UI_AURA_ENV_OBSERVER_H_

#include "ui/aura/aura_export.h"

namespace aura {

class Window;
class WindowTreeHost;

class AURA_EXPORT EnvObserver {
public:
    // Called when |window| has been initialized.
    virtual void OnWindowInitialized(Window* window) = 0;

    // Called when a WindowTreeHost is initialized.
    virtual void OnHostInitialized(WindowTreeHost* host) { }

    // Called when a WindowTreeHost is activated.
    virtual void OnHostActivated(WindowTreeHost* host) { }

    // Called right before Env is destroyed.
    virtual void OnWillDestroyEnv() { }

protected:
    virtual ~EnvObserver() { }
};

} // namespace aura

#endif // UI_AURA_ENV_OBSERVER_H_
